You have the ability to add individual workouts, individual plans, or complete Plan Builder plans to your Calendar, which allows you the flexibility to work around whatever schedule you may be planning around.
The Taper weeks can be found in Weeks 7 and 8 of the correlating Specialty Phase, and while you can’t add those weeks by themselves, you can add the Specialty Phase to your Calendar, trim the extra weeks, and then copy/paste the taper weeks to where they belong.
Since you won’t be using Plan Builder, you can use articles in our Help Center to help inform your decisions as well.
Now, all that being said, it will likely be easier to use the Plan Builder tool to help you build your training for the rest of the season. It may take some trial and error, but by setting the start date as the day in September you started training, you will get some of the “credit” for all the training you’ve done thus far, and it will help you to choose the best way to proceed.